First slide

Trignometry

Question

If f(x) = sin³x – cos(2x), then the value of $f (\frac{π}{2})$ is :

Easy

A

0
B

2
C

1
D

-2

Solution

$\sin (\frac{π}{2}) = 1 a n d \cos (2 \frac{π}{2}) = - 1 f (\frac{π}{2}) = 1^{3} - (- 1) = 2$

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